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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 02-12-2014, 07:27 AM
amedic4rent amedic4rent is offline
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Power Cut Off while Driving

Hello all. Just thought I'd share my recent hellish experience with my 07 328xi. It all started with a odd rattling noise in the rear end. A half hour later down the road and the whole car shuts down... No lights... No power.... All at once. Got it off the road and had a friend show up with a Multi-meter. We determined that the main fuse within the power distribution block had blown. It only made sense that a short had occurred in the main pos wire that runs to the fuse box in the front of the car. This is what I found. Click image for larger version

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Turns out the rear passenger shock went bad and when it did... it pushed up through the trunk compartment and grabbed the wire assembly that runs right above it. WTF right? The quick fix was to fix the short short (electrical tape worked for the time being) then run the main lead directly to the pos terminal. Finally I removed the shock and drove the car to safety where the proper repairs could occur. I don't have roadside assistance and was able to make this "quick fix" with a car jack and common tool kit. I pray this isn't a common issue but incase it does happen to anyone else I hope my story helps. Click image for larger version

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  #2  
Old 02-12-2014, 07:49 AM
jburke4689 jburke4689 is offline
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It looks like that shock has been bad for a very long time. How many miles are on it?
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Old 02-12-2014, 09:59 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by amedic4rent View Post
Hello all. Just thought I'd share my recent hellish experience with my 07 328xi. It all started with a odd rattling noise in the rear end. A half hour later down the road and the whole car shuts down... No lights... No power.... All at once. Got it off the road and had a friend show up with a Multi-meter. We determined that the main fuse within the power distribution block had blown. It only made sense that a short had occurred in the main pos wire that runs to the fuse box in the front of the car. This is what I found. Attachment 422244
Turns out the rear passenger shock went bad and when it did... it pushed up through the trunk compartment and grabbed the wire assembly that runs right above it. WTF right?

I'm thinking that this is unusual for BMW automobiles. Has anyone else had this happen?

That orange/brown in the photo might be gasket material, but there's an outside chance it is rust! Would you live in an area with salted roads?
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Old 02-12-2014, 06:51 PM
amedic4rent amedic4rent is offline
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60k and yes the roads are salted here in PA, heavily... It's also been one of the worst winters we've had in a while. I figured the issue was rare to say the least but if there's one other person that can benefit from my misfortune then I guess I'd feel a little better.


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Old 02-12-2014, 07:13 PM
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CALWATERBOY CALWATERBOY is offline
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Originally Posted by amedic4rent View Post
60k and yes the roads are salted here in PA, heavily... It's also been one of the worst winters we've had in a while. I figured the issue was rare to say the least but if there's one other person that can benefit from my misfortune then I guess I'd feel a little better.

Aw crap! You'd better have a good look-see from the bottom before a new shock goes in. Up by the Pittsburger?

Once had Bilstiens set way too firm for my 3 series rear shock mounts....both cracked the shock tower formed area! Welded. Sure was sweet with 'em heavily damped....for awhile.

What happened to that ride after's a story for another day. Let me say this: The guy I sold it to cut the top off and ran the OD back 100k....then sold it again....
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Old 02-13-2014, 08:18 AM
fdriller9 fdriller9 is online now
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Where is that cable running to?

I'm pretty sure the power cables for the starter/alternator and the jump terminals are routed under the car.
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Old 02-13-2014, 08:30 AM
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DSXMachina DSXMachina is offline
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I've seen this problem before on cars other than BMWs. What happened in this case is rare. Salt got at the area where the bottom large washer sits on the piston. That washer secures the rubber 'donut' insulator between itself and the mount. Apparently the rust so corroded the washer that it slipped downwards on the piston allowing the piston to move upwards. It popped out the plastic trim cover and slammed into the cable. (We should be able to see another large washer similar to the one which is clearly visible attached to the nut in the first photo.)
It is possible that this happened when the chassis bottomed out on a pothole which would be the time when the shock mount has to withstand a massive amount of force. A clue that this is what happened is that the seal blew out as evidenced by the hydraulic fluid down the side of the shock body.
Basically the fault was with the washer, not the shock, but nitpicking doesn't make it better.

Last edited by DSXMachina; 02-13-2014 at 08:36 AM.
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